Addition of Rational Numbers (3)

1. Modify the add() function in the previous exercise so that it works with the following main program.
   Note that in this version, the function returns a data type Rational.

   
   Rational add(Rational a, Rational b);
   
   int main()
   {
       const unsigned short N = 5;
       Rational a[N]   = { {1, 1}, {1, 2}, {1, 3}, {1, 4}, {1, 5} };
       Rational b[N] = { {1, 1}, {2, 1}, {3, 1}, {4, 1}, {5, 1} };
       Rational c[N];
       int i;
       for (i=0; i<N; i++)
       { 
           c[i] = add(a[i], b[i]); 
           print(a[i]);
           cout << " + ";
           print(b[i]);
           cout << " = ";
           print(c[i]);
           cout << endl;
       }
       return 0;
   }